Create a premium retro travel poster advertising “YELLOWSTONE NATIONAL PARK”. Use a 1930s WPA-inspired illustration style with simplified geometric mountains, pine forests, a dramatic geyser erupting into the sky, and warm vintage colors including burnt orange, forest green, cream, and muted blue. Across the top place large bold text reading “YELLOWSTONE”. Beneath it display “NATIONAL PARK”. At the bottom include the slogan “SEE AMERICA’S WILD HEART” followed by “WYOMING • MONTANA • IDAHO”. Add a small badge reading “EST. 1872”. Use period-appropriate block typography, screen-printed texture, slightly weathered paper, strong vertical poster composition, authentic vintage tourism design. No extra text.